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TRANSMISSION OF PARASITES
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the disease-producing trypanosomes. It is to be noted that the trypanosome at intervals, not as yet
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Tropical_Diseases_-_Fig_47.png/250px-Tropical_Diseases_-_Fig_47.png)
Fig. 47.—General view of digestive tract of Glossina palpalis. (After Minchin, Report on Sleeping Sickness to the Royal Society.)
Ph., pharynx; Œs., œsophagus; C. s. d., common salivary duct; S. d., salivary ducts; Pro., proventriculus; Th. in. thoracic intestine; S. st., sucking stomach; S. g., salivary glands; Abd. in., abdominal intestine; R., rectum; R. amp., rectal ampulla.
ascertained, is incapable of infecting the fly. For this observation also we are indebted to Miss M. Robertson.